Wi-Fi or Ethernet connection is established, and IP address is obtained.
Asio chat client connects to the corresponding server whose port number and IP are defined through the project configuration menu.
Chat client receives all messages from other chat clients, also it sends message received from stdin using idf.py -p PORT monitor.

Running the example

Open the project configuration menu (idf.py menuconfig) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in examples/protocols/README.md for more details.
Set server IP address and port number in menuconfig, "Example configuration".
Start chat server either on host machine or as another ESP device running chat_server example.
Run idf.py -p PORT flash monitor to build and upload the example to your board and connect to it's serial terminal.
Wait for the board to connect to WiFi or Ethernet.
Receive and send messages to/from other clients on stdin/stdout via serial terminal.

See the README.md file in the upper level 'examples' directory for more information about examples.